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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7900f17a44b621c8105758482ccd71bd7c4cd64a9a50b3477c4700118cfeb18f' 
  AND token = 'pj8+T5dtUQQDY2U5EzcCTjCiEQwDCR7l04MIyhz4Dts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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