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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fca3e32f866c2e0a63554dac87a93bfcb0a06e40643248c5afc9231934ba0af8' 
  AND token = 'H31XF5oNSS62YG1IyeTlocmBaAIkAz7Id4hkeixkU5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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