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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88e4270427dd7ce6fb55400d2b358556e529448d7e8120307bc59a234e45a942' 
  AND token = 'KQRkcyE28zQSrGOcI0h7cqNNI5F1PA5P9+kycZcMOnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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