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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4546c540038c972098c952f5e358b46661960957ccdc290a3a29ff1fe7714a2d' 
  AND token = 'Dd93wQ7mndtfh8iEW8JfBrAFqe0QKF58tSK2mK6C9Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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