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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53e3cedd94f0a8857a6c65a618c6a3c858ff6772192a21ceed1dc8a293643b3a' 
  AND token = '6eZ3jBT4gjU7L2pjvp3EDGn/84yyEu02qsgxD5z7834=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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