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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d959d46fde989732c31866b5d2c1e6d9e4b31843002be638738e36cb2ee628d' 
  AND token = '8WN3iA24hClJ6uL8i+Z87ddKVFuSnns1QkBGbmix0P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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