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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62d5479a42cd3a63e61fbec9ac12ed25d9a195ddb35e9d0907813bf6053b1bb5' 
  AND token = '8TgrehImKgcDUSjeZHCVCUzYaS8TN9Pc3UMe1BPpJHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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