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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdb23dbb5a6a7e4005b554d2f4fa74afd55d821dcc24532ba8d28311edecbea1' 
  AND token = '55NjnzW8kJ2PKRQu96MhniG5W8zNCR86Dn5gUM6fUMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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