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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4733f1e28e30c12bcc52cab7da79cf9adbc3399c8e8e38794ad1fe37053ba3d2' 
  AND token = '3s6fUaawVyjAKQzhfjwhnkaV5Y3IdmXczD2sMVO4kD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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