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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '552635c965cb46e4d6761f54e7bef82cd8e1044e810e27d2b4cb8faca7e6c150' 
  AND token = 'A+1QwHH6ofR0J7bTk7Qda/KLuWmANbwW2mf98mLqaJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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