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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '261a10d543ba400ae1f2d9a9dfd591bc82fb1b5bdd5e4089ea9957f1db74f5d5' 
  AND token = 'ei5KJ0glzWiEALD3jv6Epu/l3TSgpGz7qixfap78vkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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