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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '227756bb45d2253a5429fc65adfe85ee25678ca5dec7c91aa3e5dc58e9f6d381' 
  AND token = 'L6Er2RwbiUTRyPgV/iA0JBz52ibRb7PCymm0/8vtRc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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