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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '295ea7895855653f4407abe6fc9f91312aec92e4792e79a31bcce5ecec45c55e' 
  AND token = 'UL4oeO1H5iJ3kvgJQ8sFiPywIt6Emz13ywbadUgDNDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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