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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '013e50d3d9e915ba864002fe5d82f53a4814d85a6817b673c05e2f175a376e81' 
  AND token = 'frMVGf6QRfrC1M76axwKK/KSgrby8uV//lLjDXGumIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}