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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5dca0ec4d430667abf74b86dc353be9909fe5354e805f7272cc23317a7156a81' 
  AND token = 'Oe71z3eQYIDZU1pK4NDR4Xhuc6I0xDM2xCO96p8I7jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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