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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7dde79ca4e5fe2e9a7c48ba51763a7824f2bea320aa3511c0f2a616d8162fc95' 
  AND token = 'L784J0hieH82ndfdDzcx1wt9PGUv8Xs0SNomA1VK6jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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