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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '876aa6adfae144503fca64fc45a657c35e7a96f2691bab60b5da7d15207c2343' 
  AND token = 'AUc3uN0dO/dvXRdUem12ZtDXaitcyBKceKO7/pIqlYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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