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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae22b15f14b4c126bf0247e89925c36b9847dfdb084ab51209d468e10f8b0383' 
  AND token = '5bKS87vC3KX0zrSlkknybwfLyLV2XQ5l0nFpMnsApOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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