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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7c5b1a96b700843caa90167a681c18c533e0764e1f0b07920891ceeea60355c' 
  AND token = 'mgMJiUpEj6kGaivRsY6Yyg4zA+zUzqf0/H88W7xy4PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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