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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2daa3b6a07ba741255a4abbc9713f129fff5379af79b40b52912005b6389ae78' 
  AND token = 'SPjignKMcONoezW21f2Y7biOsnPuVfc5tdXKY/kOqAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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