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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29a7113869ba8ae67b1a07eaa8b3bc5d5d105812996711f80f52f305314a9cf3' 
  AND token = 'B0oFywnQ+dqet1XbZsX108QsRmfbcJtgioA8+y4F0oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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