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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e631f73901861330f432e722abc20ccb5d589629cf325bbf42421c4684e5ad2' 
  AND token = 'Un5tZkui/O3af9nUmmJREJHVGzcgfF2Y08IbsT2fLeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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