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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ae89485b1dd17a1398163d327c1f575ac882805a5cf0b3abf6fe918bc8f6f37' 
  AND token = 'HDDbiCPa5HqSTsEI6cgTCjms/ks9HMF4OSkTmNPhA/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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