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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50c2596de70f8b9bf621e6c8721eb98ae84970798ac08b397856f2d775070c51' 
  AND token = 'auImJgK/lyOnDmD2L9F2807D2t51KHDhmWEOSM7ux1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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