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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82e297e262be9f3a1d68fe5f363949b3824d5114d7ae059af44716e780a56d46' 
  AND token = 'XzsySaatpnXaVQpkty5xPJg2Nf0uprmDvUJa6XXr1KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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