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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '086767d423a940f4f2ad4ec6eefca9e65dfd6ccba7862c59298281620bd8a699' 
  AND token = 'ub9uDrKZT86VkqvDn9m14Tsusi3UPTgFfVKmMKjutO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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