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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6c64172706473b88530ec2df1da442bc111a80ca0fae9734c0f3eb3a207b2f9' 
  AND token = 'ylvElqgSpSZnPCiixk5Ka9a9PofAHKw/N/oUz4lNya8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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