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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f390ccd1e303b97d459709f49f9ae69992cfbbd9193611b0c1cb285ec3112ae5' 
  AND token = 'cIyO79DPtDcWQNU5oMFhbcTwUOZnd3pjvP5E3v6JBxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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