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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54f88d4be4291f60cd9a61e0f586106e4c7341bf2fe45dc6bfe59be5cd046258' 
  AND token = 'jF4ixJPbtnahzfRkSG+EVFg2+OYkLgVXUYm4l4cgtb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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