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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb3e51fce051e3ba4dc786b3d7df1c9d25cfe551169be8c96a90f370a2e937d5' 
  AND token = 'M8mx5b41Zc8OZvfVJOXGcO73XG0tG/+hA2GGeSfRv54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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