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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a2bd22af9b0203ca29491d25498354397607c7f1a1bd2edeeda28f33133542e' 
  AND token = 'F3LromPCgy8lq9+oJiApSLOiSLOAwyp/qhSt06vJKqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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