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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af9abc01b413c347c688bac1bc15bdac4d3e889af6172663fab3f36bf60bdf33' 
  AND token = 'FcT3cipj5zt8ivro7yaFGjs21ONDQjn01mE/TSwAv24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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