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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb51a83ee037db8c6ec3b00f86e9c74487e7f3891d02aed59fda0f68b7cc50b3' 
  AND token = 'lk6SsrLlAzatErg3Ljb9sB664oXTtt43lB28HzU0+ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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