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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4638bf798cb0c5dd59fd11281cc6b5a5926d1eeba54e84f750c5f7f07f172e21' 
  AND token = 'xetQQz5QF0MoaYe3ibmT7d7gIQthyflnRizP2a6mqQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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