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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01cf738beb0d53761dae09d9059f046b429e5de23a80cca01bacc0049a240bf7' 
  AND token = 'Ub3i341rVGVmV56TdSFckYl9lQIpURAeB0CTB8UPz5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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