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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63b29cd0ee5560ca2a9ff238203456ad20e8868dcd66a514ff2d02d3399ad7ce' 
  AND token = 'eTmgm13bezc6tRyOM+4cOyQ1KyYaIUlJCe6ieAxc0DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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