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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b260fe0fe80902768fdd86dec9c94a0962e4a4c904ee42b9c0302a08f86db9c' 
  AND token = 'a6QvCX4MRMEWWikodHsw/ZGaYG8xeFDdn9OC6MUz5nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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