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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b9ffa5c8632f15b2cf91dce9629536e5300f22fb195d773f912235d30ac98f0' 
  AND token = 'sKrIrCNPokbt0Z0zreG8IyJ8ga69MDYI9vn8SSQHynE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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