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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67953a5ba8951c59fb0a90e26e0cefcb49b697091ea0673c7b2eb8e116199574' 
  AND token = 'jhElL02jgb1hnVD4PzluU6oYykoKWiheOy1kpvsBKME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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