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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3eca4a7030eb4fcf3f106e699cf239e5b4f2fc0998b1f98bd5d9eac74e1e1067' 
  AND token = 'mKpytaHP2KDhJQC/3DyU337/ur+AK8y9U0G3AVvWYWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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