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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c7968213dbd1d2900211330647118a99f7212d04cd329e35e3afbc738585d70' 
  AND token = '6rKxwixWefNeZZJCHlD6RmMzT+dRXvmg8bwCaTOd4ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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