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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f908a10c943bb7b2f5cd1d96ab145483c92aa7f7445cf472fffdbca070860d5b' 
  AND token = 'RoF5uh5DM3LJgrvhJzMKXSZPFpRraHrpkSUsobPt2NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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