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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '072b28c9799a953cc7aba220725aea9861241458aa58b81d04871331edfe087c' 
  AND token = 'UkFZ/pXAf2IywiEmPpbPU4qOF9DyxukoPFXUp34S6+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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