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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0388b60e391cf8771717649adbad405d338a73dc46bdae49a3f9b635e9f9509c' 
  AND token = 'u//KLeoiu4ZAUAdHAKQWhP7gS3Tj4ak7kCEl/Pd2Jg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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