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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b58a14b746b274dd7ac8aa17d8073fe9f1c83200e953de16a1b8cc77ca91c14a' 
  AND token = 'fHdWe/5Q3PFGO7oVGOvY62T9TW1IGMDa4eNkAg9zbsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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