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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e85c29fb13115eaec76eeb12235edc378f79d5cbeaef96782279dbdfe849ba6a' 
  AND token = '14jACdQTUiROlLUwOJGAlGfda5GXs5tsXooaYjG927Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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