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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f903d1cd7cb8055348c705793fdfa5cc3d57eff56694227446535bc979aa69e' 
  AND token = 'PjlNYQp+dkMRxw38a2HlMdYLdrO+H23YM/qnK2dDJKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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