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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77ea111dd37668d2dfabf731588acf4110532627c6d76cfce371a42c5b5bf58b' 
  AND token = '67sUhIKXoOTWvozyMirbi82en8dcGin3xnsC2xmyeCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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