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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d8cb8e0521bdc845d2da6444947896ca07bbaff1ff626db0175cff4b2eb1da7' 
  AND token = 'GJZkJL8kv4TPaN0e2YXRJwZh689BAk08lkoaPPBRlJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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