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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0764fa291da8ac061b034981119dafa3fc0f746a6830874924caf97e245df14' 
  AND token = '3BT05FX40Esamhyz9Rmi+Nsox3oJnKCtYpJevbJf2CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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