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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c86196782e781dc38d431043e451dd0c8f546fea7f9b73140a05c3bd3463b33f' 
  AND token = 'oXMwf70zKIjWtwQ1WLDj1f+KCmJndHMpeLKqGQDAw0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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