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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05a9b076103a84f294fc79a10b6a52d0a35948f4e457605833fd2242aaa18ea3' 
  AND token = 'bXeFNqYvbeDcdMKlii3swzDz1NZkApdipqa6GM0tlxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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