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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ec0ceb641d4871bab848c0ea4038214332756866b22f4526c1f6e074387a73c' 
  AND token = '+JJRx9n8e3xNEz4l5l8el2qnpkXODGnN4pax1MYcvCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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