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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbe607ad96263fa4a8e09cc6380264a80852f364bd1ff5d618e2b2aa3a4b122a' 
  AND token = 'PuJdQr0cS/+g+TOQX2dwfmVmaJKXBHRM3eiJxoXhirM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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