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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37e01088c514304e35d33e985d7ef7ce62b3acad87c437c8a93701a7f18ddaa6' 
  AND token = '3pB6EU1bJN+YZmNbThUVC0ufBis/dE7RzNaQaAUOfJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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