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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f99d8aade0fbe61d661a81534a77f96de97e0cc843dd9a0956b5d63e6d1cea8' 
  AND token = 'pGy2i6QMvBd6/Nhf3UeBeBGYMPXymho3fXFaWH13Whk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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