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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71fbba8ba89e816880bfe8b2f4294d88db95c92d90b81432f141a664a21effe6' 
  AND token = '0fO3R2D86o/SZsbS2p4eI5GV0Q+qfcwFQCJErLqrZf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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