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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09a43f43d1d8068573416e76f5c70c5c13e7905e7f6e734753659855480f3f40' 
  AND token = '3o8I3gQWoqEH0GS5PAIYAcNaF0pzqpAzNqUzGZnFq9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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