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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25feb5a70edc07c2f625351ad7b5552696b7f0f4ac26643dc1380b5480924950' 
  AND token = 'Aw1ZGFe2qxyCAwbNQ1kUL2Uh0kNnI4BypyYIjiycsrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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