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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '808d3af45fd4ff7fad1258436a3aae64c2260936cc77c2c42b89deb4acbeb34d' 
  AND token = 'N3H+1Yx5TTqnWlkVVc+C+IWm5oizv97NXSLK4aaCZXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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